You bought a dozen of pandesal bread in the nearby bakery store from your house. You ate 10 pieces of it during snacks time in the afternoon with your friends. The two unconsumed pandesal bread were left inside the paper bag over the next three days. You noticed that after two humid days, tiny water droplets appearing like couple of sweat had accumulated inside the bread bag which was dark. The leftover pandesal bread began to moisten. During the 3rd day, you eventually seen clusters of grayish spots on the bread surface and it smelled a foul odor. You asked your mother about it and she advised not to eat them anymore because molds were already present in the pandesal Observation/s: Problem: Hypothesis: Conclusion: HELP!

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

i think it's letter a.

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.